Liquid crystal spatial light modulator with very large phase modulation operating in high harmonic orders

Calero, Venancio; García‐Martínez, Pascuala; Albero, Jorge; Sánchez-López, Marı́a del Mar

doi:10.1364/ol.38.004663

Cited by 20 publications

(13 citation statements)

References 14 publications

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“…9-12). A diffractive profile with m π 2 maximum phase modulation -m being an integer number-operates at higher harmonic orders [13][14][15] and has proved to show interesting properties for achieving an effective reduction of the chromatic aberration that would otherwise affect severely common 1 st -diffractive order lenses. Harmonic diffractive lenses with phase shift being an odd multiple of π (or, equivalently, OPD being an odd multiple of 0 / 2 λ ) also direct light between two neighbor diffraction order images (with 40.5% energy efficiency each).…”

Section: Introductionmentioning

confidence: 99%

Extended depth of focus intraocular lens Chromatic performance

Millán¹,

Vega²

2017

Biomed. Opt. Express

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We describe a first-and-second-diffractive-order intraocular lens ((1,2)DIOL) within the class of hybrid refractive-diffractive designs for intraocular lenses (IOLs) and analyse its properties of focus extension and compensation of longitudinal chromatic aberration (LCA), particularly for lenses with low addition. Power, energy efficiency and their wavelength dependence are extended from monofocal IOL and conventional bifocal zeroth-and-first-diffractive-order IOL ((0,1)DIOL) to (1,2)DIOL of low addition. Compensation of LCA is experimentally assessed in optical bench through the through-focus energy efficiency of three Tecnis IOLs with red, green and blue illuminations: ZA9003 (monofocal), ZKB00 (bifocal (0,1)DIOL with + 2.75 D add) and Symfony ZXR00. We prove Tecnis Symfony ZXR00 IOL can be considered an example of (1,2)DIOL design of low addition, with LCA compensation in both the distance and intermediate foci, whereas the bifocal (0,1)DIOL does not compensate in the distance focus. However, the energy efficiency of (1,2)DIOL for wavelengths other than the design wavelength is markedly more asymmetric.

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Section: Introductionmentioning

confidence: 99%

Extended depth of focus intraocular lens Chromatic performance

Millán¹,

Vega²

2017

Biomed. Opt. Express

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“…In a previous work [4], the use of LC-SLM devices with extended phase range, i.e., from 0 to 4π, was showed for diminishing artifacts like fringing effects and pointed out the possibility of exploiting this fact to reduce chromatic aberrations. Further, inverted chromatic dispersion for a blazed diffraction grating was also reported [5] by using a very high phase modulation depth SLM which was designed for infrared and operated under visible light. A theoretical chromatic study of other elements, such as axicons or light swords [6], has also been reported in literature by means of diffraction integrals.…”

Section: Introductionmentioning

confidence: 99%

Chromatic aberration control with liquid crystal spatial phase modulators

et al. 2017

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The chromatic behavior of diffractive optical elements, exhibiting 2π-wrapped phase profiles, implemented into liquid crystal spatial light modulators (LC-SLM) is described. A wrapped phase map is only equivalent to the original continuous profile for the design wavelength while at other wavelengths there are unwanted phase jumps and the profile does not correspond to a pure defocus. For those conditions the wrapped profile behaves as a multiple order lens (multi-focal lens). The optical power dispersion for each order is linearly proportional to the wavelength, while the energy of each order depends on the design wavelength and the material dispersion. For practical purposes, for most of the visible range only first order (main defocus) is relevant but two other orders may also be considered depending on the actual PSF of the system. As an application, we demonstrate that the longitudinal chromatic aberration of the eye can be compensated by the diffractive lens dispersion when the appropriate defocus is programmed into the SLM.

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“…Nowadays, modern liquid crystal on silicon (LCoS) modulators provide phase-only modulation with larger phase modulation dynamic range that may reach 4π o even 8π for some operating wavelength. These devices are useful to test new designs of first-order, second-order [8] and higher order [9] diffractive optical elements with no need of fabricating them physically, and with the often-stated advantages of flexibility and speed at a reasonable cost. In addition, shadowing effects produced by too high echelettes are overcome when the multiorder diffractive element is implemented by a SLM.…”

Section: Introductionmentioning

confidence: 99%